I think they've spent far too much money on the new TARDIS interior & opening title sequence to change them again now. I think they, and Clara, will at least be around through Season 8. Unless Clara somehow doesn't survive the next 2 specials at all.

Technically she can't die. There are millions of her at different ages in time.

So the women who gave Clara the doctor's phone number (The Bells of St John)could be Clara at age 80 or something.

I have a feeling we'll lose present day Clara but Moffat will write something that gives us a bit of hope like he always does.